Delaware Route 9A (DE 9A) is a two- to four-lane road in Wilmington, Delaware that serves as the primary access route to the Port of Wilmington as well as provide access to Interstate 495 (I-495). The official designation of the route runs along Terminal Avenue between DE 9 and the Port of Wilmington, interchanging with I-495. Signage has the route continuing north along Christiana Avenue to an intersection with U.S. Route 13 (US 13) and DE 9 for a total length of . Christiana Avenue originally became a state highway in the 1920s, becoming a part of US 40 that connected to a ferry across the Delaware River to Penns Grove, New Jersey. US 40 was removed from this road in the 1930s and it later became part of DE 48, which was subsequently removed in the 1950s following the discontinuance of the ferry. DE 9A was designated by 1971.